Hello,
How long has it been swollen like that for?
It could be a tumor, an abscess, or a pregout syndrome causing renal issues which causes swelling of extremities, etc.
For now, all you can do is monitor her. Try to get some extra oral fluids into her as well until you can get a blood test on her to figure out what in the world is going on.
Is she eating anything right now?
What type of lighting are you using, do you have a
UVB light? If so, what type & brand are you using? A fluorescent tube bulb or a compact/coil light?
Tracie